An emergency braking system for use in connection with a drive apparatus including a drive belt and pulley system for transferring power from a prime mover to a transmission or transaxle. The braking system includes a pulley engaged to the drive belt and a spring engaged to the pulley to provide a bias force thereto. When tension from the belt is removed from the pulley, the spring forces the pulley into engagement with an actuator to engage a brake mechanism.
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14. A vehicle having a prime mover disposed on a vehicle frame, comprising:
at least a first transmission providing output to a vehicle axle and comprising a brake mechanism;
a drive belt and pulley system for transferring power from the prime mover to the first transmission;
an idler pulley mechanism comprising an idler pulley engaged to the drive belt and retained in a first position by tension from the drive belt;
a pivot rod having a longitudinal axis of rotation for actuating the brake mechanism; and
an emergency brake actuator, comprising:
a brake arm assembly engaged to one end of the pivot rod for causing rotation of the pivot rod, the brake arm assembly having a first position where the brake mechanism is engaged and a second position where the brake mechanism is disengaged;
a first bias member engaged to the brake arm assembly for biasing the brake arm assembly toward the first position;
an actuator connected to the brake arm assembly; and
a second bias member engaged to the idler pulley mechanism, whereby when tension from the drive belt is removed from the idler pulley, the second bias member forces the idler pulley mechanism into engagement with the actuator.
17. A vehicle, comprising:
a prime mover driving an input pulley connected to a drive belt;
a first transmission driving a first wheel of the vehicle, the first transmission comprising a first housing, a first input shaft, a first drive pulley disposed on the first input shaft and driven by the drive belt, and a first brake arm located external to the first housing and movable between an engaged position and a disengaged position;
a first emergency brake actuator disposed external to the first transmission and engaged to the first brake arm;
a second transmission driving a second wheel of the vehicle, the second transmission comprising a second housing, a second input shaft, a second drive pulley disposed on the second input shaft and driven by the drive belt, and a second brake arm located external to the second housing, and movable between an engaged position and a disengaged position;
a second emergency brake actuator disposed external to the second transmission and engaged to the second brake arm; and
a release member capable of actuating both the first and second emergency brake actuators when a predetermined condition is met, without any input from an operator of the vehicle.
16. A drive apparatus, comprising:
a prime mover and a first pulley powered by the prime mover;
a transmission comprising a housing, an input shaft, a second pulley disposed on the input shaft, and a brake mechanism comprising a rotatable pivot rod having one end external to the housing, wherein the pivot rod rotates about its longitudinal axis;
a brake arm disposed external to the housing for engaging the one end of the pivot rod, the brake arm having a first position where the brake mechanism is engaged and a second position where the brake mechanism is disengaged;
a belt connecting the first pulley to the second pulley to transmit force from the prime mover to the input shaft;
a first bias member for biasing the brake arm to the first position;
a second arm engaged to the brake arm and capable of rotating the brake arm;
an emergency brake assembly engaged to the belt, whereby tension from the belt retains the emergency brake assembly in a first, disengaged position; the emergency brake assembly further comprising a second bias member to bias the emergency brake assembly towards a second, engaged position, whereby when tension from the belt is removed from the emergency brake assembly, the second bias member forces the emergency brake assembly to the second position which causes the brake arm to rotate to its first position where the brake mechanism is engaged.
1. A drive apparatus, comprising:
a prime mover and a first pulley powered by the prime mover;
a transmission comprising a housing and an input shaft having an external end disposed outside the housing;
a second pulley disposed on the input shaft;
a belt connecting the first and second pulleys to transmit force from the prime mover to the transmission;
a brake mechanism comprising a rotatable pivot rod having one end external to the housing, wherein the pivot rod rotates about its longitudinal axis, and a brake arm assembly disposed external to the housing for engaging and rotating the pivot rod, the brake arm assembly having a first position where the brake mechanism is engaged and a second position where the brake mechanism is disengaged;
a first bias member engaged to the brake arm assembly and providing a first spring force for biasing the brake arm assembly toward the first position;
a movable assembly engaged to the belt, and comprising a contact member, whereby tension from the belt retains the contact member in a position away from the brake arm assembly; and
a second bias member engaged to the movable assembly and providing a second spring force to bias the contact member towards the brake arm assembly, whereby when tension from the belt is removed from the movable assembly, the second bias member forces the contact member into engagement with the brake arm assembly to actuate the brake mechanism.
2. The drive apparatus of
3. The drive apparatus of
4. The drive apparatus of
5. The drive apparatus of
6. The drive apparatus of
7. The drive apparatus of
8. The drive apparatus of
9. The drive apparatus of
10. The drive apparatus of
11. The drive apparatus of
12. The drive apparatus of
15. The vehicle of
a second transmission providing output to a second vehicle axle and comprising a second brake mechanism;
a transverse rod extending from the first transmission to the second transmission; and
a second emergency brake actuator engaged to the second transmission and comprising a second brake arm assembly, wherein engagement of the idler pulley mechanism with the actuator rotates the transverse rod to actuate the second brake mechanism.
19. The vehicle of
20. The vehicle of
21. The vehicle of
22. The vehicle of
23. The vehicle of
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This application is a continuation of U.S. patent application Ser. No. 12/057,874, filed Mar. 28, 2008, which claims the priority of U.S. Provisional Patent Application Ser. No. 60/909,789 filed on Apr. 3, 2007. The prior applications are incorporated herein by reference in their entirety.
This invention relates to powered vehicles, including a brake and an emergency brake actuation assembly for use in connection therewith. The invention is disclosed herein in connection with a zero-turn mower device including two hydrostatic transmissions powered by a prime mover. It will be understood that other embodiments could be used in connection with the inventions disclosed herein.
This invention discloses a system by which the brake mechanism of a belt-driven hydrostatic transaxle or other drive device may be activated automatically in the event the drive belt breaks during operation. As will be understood, transaxles such as those shown herein will generally have a brake mechanism used as a parking brake, and such brakes are generally not intended for use as a dynamic brake. Dynamic braking is usually provided by the hydraulic system and the user may alter the output of the hydraulic apparatus to effectively brake the vehicle. Such hydrostatic transaxles including a parking brake mechanism are disclosed, for example, in commonly owned U.S. Pat. Nos. 6,672,058 and 6,775,976, the terms of which are incorporated herein by reference, including in particular the details of the brake and hydraulic transmission. It will be understood, however, that while this invention is described herein as being used with a parking brake, the invention is not so limited and could be used with other brake mechanisms.
When the drive belt for such a drive apparatus breaks during operation, the vehicle can free wheel down a slope. If the operator strokes the controls to neutral, the normal hydraulic braking will slow the vehicle. If the operator over-corrects by stroking the controls in the opposite direction, the vehicle can continue to free wheel. At that moment, though, the operator may not consider applying the parking brake, as it is normally not used during vehicle operations. Thus, a need for an automatic braking system is presented to provide for emergency braking in such a situation, and the present invention provides such a system.
A better understanding of the objects, advantages, features, properties and relationships of the invention will be obtained from the following detailed description and accompanying drawings which set forth an illustrative embodiment and is indicative of the various ways in which the principles of the invention may be employed.
The description that follows illustrates and exemplifies one or more particular embodiments of the present invention in accordance with its principles. This description is not provided to limit the invention to the embodiments described herein, but rather to explain and teach the principles of the invention in such a way to enable one of ordinary skill in the art to understand these principles and, with that understanding, be able to apply them to practice not only in the embodiments described herein, but also other embodiments that may come to mind in accordance with these principles. The scope of the present invention is intended to cover all such embodiments that may fall within the scope of the appended claims, either literally or under the doctrine of equivalents.
A pair of transaxles 12L, 12R are mounted on frame 22, each comprising a transaxle housing 30, 32 and an output axle 14 to drive one of the rear wheels 16 of mower 10. In the depicted embodiment, transaxles 12L, 12R are similar to those depicted in commonly owned U.S. Pat. No. 7,134,276, the terms of which are incorporated herein by reference, including in particular the details of the hydraulic transmission disclosed therein. Transaxles 12L, 12R are intended to be internally identical, and can also be externally identical but for the brake actuation mechanism as described herein. Thus, the description herein will focus on transaxle 12L, on the left side of mower 10 as shown in
In the embodiment depicted in
Slot 35 in clamp arm 34 permits the activation of brake arm 52 by movement of linkage 36a without movement of clamp arm 34 and therefore without the activation of emergency brake mechanism 40. Similarly, slot 37 in linkage 36a also permits the emergency brake mechanism 40 to be activated, as will be described below, without moving linkage 36a.
As will be understood, pulley 29a is connected to an input shaft (not shown) to drive an internal hydraulic pump (not shown). This hydraulic pump could be of the axial piston type such as is shown in U.S. Pat. No. 7,134,276 previously referenced, but the particular type of pump or hydrostatic transmission is not critical to this invention. Pulleys 29a, 29b are thus used to respectively drive transaxles 12L, 12R, and are powered by belt 27 driven by drive pulley 28. As is generally known, an idler pulley 42 is also used to engage belt 27 to provide the appropriate tension in the belt.
The emergency brake mechanism 40 comprises a moveable assembly including swing arm 60 on which idler pulley 42 is mounted by means of a fastener 43a; swing arm 60 pivots about the point at which a fastener 43b connects swing arm 60 to transverse frame member 22a. Swing arm 60 and idler pulley 42 are retained in the operative mode as shown in, e.g.,
Emergency brake mechanism 40 further comprises clamp arm 34 which is capable of engaging brake arm 52 and forcing rotation of brake arm 52 clockwise to activate the braking system. Spring 38 is secured to clamp arm 34 and to a connection point or bracket 33 secured to transaxle housing 30. Any fixed structure could be used for this connection; spring 38 biases clamp arm 34 toward the activated position shown in
Emergency brake mechanism 40 further comprises a striker 62 attached to and moveable with idler pulley 42. Spacer 67 may be used to separate idler pulley 42 from striker 62. Tension spring 58 acts as a bias member to provide a bias force to swing arm 60. Spring 58 is engaged to idler pulley swing arm 60 and is also secured to bracket 64 and pin 65 in a manner so that a spring force is applied to swing arm 60. As noted previously, idler pulley 42 and swing arm 60 are held in the operative position (
Release arm 46 is secured to clamp arm 34 by means of a pivot joint fastener 43f, so that as release arm 46 rotates from the position in
As noted previously, emergency brake mechanism 40 used on second transaxle 12R is substantially the same as described above, as the rotation of transverse rod 48 will trigger movement of a similar clamp arm 34, to which rod 48 is similarly secured. This action will activate a second brake (not shown) internal to second transaxle housing 32 so that braking is provided to both transaxles 12L and 12R at the same time. Thus, it can be seen that a single emergency brake actuation mechanism 40 is used to actuate the brakes on both transaxles.
Depending on the vehicle application, additional vehicle frame stiffening members may be required to prevent the flexing of the vehicle frame during operation from damaging transverse rod 48.
The alternative embodiment shown in
While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangement disclosed is meant to be illustrative only and not limiting as to the scope of the invention which is to be given the full breadth of the appended claims and any equivalents thereof.
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